MPE Estimation

FCC ID: RU5AWBC2E

RF Exposure Info

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FCCID_613569

FCC ID.: RU5AWBC2E                                                   Report No.: EME-051218
                                                                             Page 1 of 5




   Maximum Permissible Exposure (MPE)
           Evaluation Report

                         Report No.      : EME-051218
                         Model No.       : AWBC2E
                         Issued Date     : Nov. 10, 2005




     Applicant     : Asia Pacific Microsystems, Inc.
                     No. 2, R&D Road 6, Science-Based Industrial Park,
                     Hsinchu, Taiwan.

     Test By       : Intertek Testing Services Taiwan Ltd.
                     No. 11, Lane 275, Ko-Nan 1 Street, Chia-Tung Li,
                     Shiang-Shan District, Hsinchu City, Taiwan



     This test report consists of 5 pages in total. It may be duplicated completely
     for legal use with the allowance of the applicant. It shall not be reproduced
     except in full, without the written approval of Intertek Laboratory. The test
    result(s) in this report only applies to the tested sample(s).




      Project Engineer                                  Reviewed By




       Jerry Liu                                         Kevin Chen


FCC ID.: RU5AWBC2E                                                                                 Report No.: EME-051218
                                                                                                           Page 2 of 5


                                                  Table of Contents

Summary of Tests ............................................................................................................. 3

1. Introduction .................................................................................................................. 4

2. RF Exposure Limit ....................................................................................................... 4

3. RF Exposure calculations ............................................................................................. 5

4. Test results .................................................................................................................... 5


FCC ID.: RU5AWBC2E                                       Report No.: EME-051218
                                                                 Page 3 of 5


Summary of Tests

MPE Evaluation meet FCC OET No. 65: 1997/ IEEE C95.1-1999

      Bluetooth 2.0+EDR Class 2 USB Dongle-Model: AWBC2E
                      FCC ID: RU5AWBC2E

      Test                          Reference                      Results
 MPE Evaluation    FCC Guidelines for Human Exposure IEEE C95.1   Complies


FCC ID.: RU5AWBC2E                                                Report No.: EME-051218
                                                                          Page 4 of 5

1. Introduction

The EUT operates in the 2.4GHz ISM band. Due to the EUT (include antenna) at its
normal operation distance is near by the human body (assume 0.1cm), the EUT was
defined as a Portable Device.


The reason to do the MPE Evaluation is to avoid the RF hazard to human body. The
maximum output power and gain of the antenna were used to calculate the limited
distance from the product. The limit for Maximum Permissible Exposure (MPE)
specified in FCC 1.1310 is followed.



2. RF Exposure Limit

According to FCC 1.1310: The criteria listed in the following table shall be used to
evaluate the environmental impact of human exposure to radio-frequency (RF) radiation
as specified in 1.1307(b).

                   Limits for Maximum Permissible Exposure (MPE)

   Frequency       Electric Field Magnetic Field
                                                     Power Density      Average Time
     Range           Strength         Strength
                                                       (mW/cm2)          (minutes)
     (MHz)            (V/m)            (A/m)
                   (A) Limits for Occupational / Control Exposures
    30-300              61.4            0.163              1.0                 6
   300-1500              -                 -             F/300                 6
 1500-100,000            -                 -                5                  6
               (B) Limits for General Population / Uncontrolled Exposure
    30-300              27.5            0.073              0.2                30
   300-1500              -                 -             F/1500               30
 1500-100,000            -                 -               1.0                30

F= Frequency in MHz


FCC ID.: RU5AWBC2E                                              Report No.: EME-051218
                                                                        Page 5 of 5

3. RF Exposure calculations

From §FCC 1.1310 table 1, the maximum permissible RF exposure for an
uncontrolled environment is 1mW/(cm2)
Power density (S) is calculated by the following formula:

S = (P * G)/4πR2

where, S = Power density (mW/cm2)
       P = Output power to antenna (mW)
       R = Distance between radiating structure and observation point (cm)
       G = Gain of antenna in numeric
       π = 3.1416

Example:
          Assume a portable device operates at 2412MHz and its maximum output
power is 20mW, and the maximum gain of antenna is 1 (numeric) /0dBi.

then the power density (S) = (20 * 1)/4*π*(0.1)2 =   (mW/cm2)

4. Test results

                   Channel     Maximum Output power Power density Limit of
   Channel        Frequency   antenna gain to antenna             power density
                    (MHz)      (numeric)     (mW)      (mW/cm2)    (mW/cm2)
      1              2402         1.00        0.89    0.000176494     1.0
      40            2441          1.00           1.00     0.000199402         1.0
      79            2480          1.00           1.34     0.000267135         1.0

The Notice in Installation Manual has been stated as below:
While installing and operating this transmitter, the radio frequency exposure limit of
1mW/(cm*cm) may be exceeded at distances close to the transmitter. therefore, the user
must maintain a minimum distance of 20 cm from the device at all time.



Document Created: 2005-12-16 12:30:38
Document Modified: 2005-12-16 12:30:38

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